Piston and ring



Apr 29, 1924. 1,492,043

L. MATTSON PISTON AND RING Filed Allg- 17, 1922 dZI.. Miiz Patented pr., 29, 1924.

LnRoYMArTsoN, or vANooUvERfwAsHINGroN.

PISTON AND RING.

Application filed August I7, 1922. Serial No. 582,431.

To all whom t mwy concern:

Be it known that I, LEROY MATrsoN, a citizen of the United States, residing at Vancouver, in the county of Clarke and State of Washington, have invented a new and useful Piston and Ring, of which the following is a specification.

This invention relates to istons, and aims to provide novel means or utilizing the compression within acylinder for expand ing the piston rings to cause them to closely engage the wall of the cylinder in which the piston is moving.

Another object of the invention is to provide a novel ring structure whereby the ring will be contracted to a degree on the suction stroke of the piston to permit oil to readily flow over the wall of the cylinder to properly lubricate the same.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of. what is claimed, without departing from the spirit of the invention.

Referring to the drawing:

Figure 1 is a plan view of a piston constructed in accordance with the invention.

Figure 2 is a fragmental sectional view through the piston.

Figure 3 is a sectional view through the piston ring used in connection with the piston.

Referring to the drawing in detail, the reference character 5 designates the piston,

which may be constructed of any suitable metal, the same being formed with a de- .pressed portion 6.

This depressed portion 6 is disposed substantially centrally of the upper surface of the piston to provide a chamber at one end fof the piston to trap a portion of the comformed in the upper surfaces thereof, which cut out portion' has4 an inclined wall 10 forming a pocket with the inner wall of. the ring groove in which the ring `is positioned. The ring member is provided with a groove 10 in its upper surface, providing a pocket to trap the exhaust gases to cause the ring toclosely engage the wall of its groove. Disposed directly under the ring is the usual piston ring indicated at 1l and adapted to increase the leak-proof qualities of the piston to insure a tight lit between the piston a'nd its cylinder. The piston operates as follows: I

Assuming that the piston is moving upwardly within its cylinder or on the compression stroke. a. portion of the charge being compressed enters the chamber formed by the depression 6, where the same is forced outwardly through the radiating openings 7, the force of the compression being 'directed against the inclined wall l0 of the ring where the same is trapped, to the end that the ring is expanded within its seat or groove until the ring closely engages the wall of the cylinder.

Upon the reverse movement of the piston, the suction caused by the downward movement of the piston is also directed to the chamber formed by the depressed portion 6 to the end that the ring is contracted permitting the piston to move more freely thereby obviating excessive wear on the ring.

Having thus described the invention, what is claimed as new is ln combination with a piston having an upper ring groove and a central chamber formed in one end thereof and radiating bores providing communication between the chamber and ring groove, a ring positioned in the ring groove, said ring having a cut out portion defining an inclined wall adapted to lie opposite to the radiating bores. and said ring having a groove formed therein and disposed at the lower edge of the inclined wall, said inclined wall and groove providing a chamber with one'wall of the ring groove to receive the impact from an explosion directed to the piston.

In testimony that l claim the foregoing. as my own, I have hereto aiiixed my signature in the presence of two witnesses.

LEROY MATTSON,

Witnesses:

Es'rns SNEDECOR,

GEORGE N, 'Vioomnmrd 

